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Application of Homogeneous and Inhomogeneous Two-Phase Models to a Cavitating Tip Leakage Vortex on a NACA0009 Hydrofoil

Excerpt

Two-phase modeling plays an important role for the correct prediction of cavitation phenomena. However, the computational effort grows with increasing complexity of the model. Consequently, complex models should only be applied if they lead to a significant improvement of the results. In the scope of this study, homogeneous and inhomogeneous models are applied to a cavitating tip leakage vortex on a NACA0009 hydrofoil at 10° incidence angle. Two different cavitation model constants from literature are applied for the homogeneous model. For the inhomogeneous approach, the impact of bubble size diameter is investigated. Furthermore, a constant drag coefficient 0.44 is compared to Schiller Naumann drag model. The results indicate that for the presented case, the inhomogeneous model does not lead to a significant improvement of the simulation results, which can be explained by a low Stokes number due to small bubble diameters. All investigated setups show similar results, which underline that the homogeneous model is sufficient to resolve the present cloud cavitation as well as the cavitating tip separation and tip leakage vortex.

Introduction
Numerical Modeling
Computational Setup
Mesh Study and Turbulence Model Selection
Numerical Results
Conclusion
Acknowledgements
References
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